Appeal No. 1998-1819
Application No. 08/364,972
BACKGROUND
The invention is directed to a method and apparatus for providing impact
resistance to a hard disk drive. In particular, the invention serves to maintain a constant
flying height of the magnetic head over the disk. Representative claim 1 is reproduced
below.
1. A method of providing axial control and outside impact resistance for a hard
disk drive to maintain a normal flying height of a head by controlling a suspension of
said hard disk drive, said method comprising the steps of:
sensing one of a tensive state and a compressive state of said suspension,
said tensive state of said suspension indicating that a flying height of said head is
greater than said normal flying height, said compressive state of said suspension
indicating that said flying height of said head is less than said normal flying height;
generating a value indicative of an increase in reverse tensive force
necessary for application to said suspension to return said head to said normal
flying height when said tensive state of said suspension is sensed in said sensing
step; and
generating a value indicative of an increase in reverse compressive force
necessary for application to said suspension to return said head to said normal
flying height when said compressive state of said suspension is sensed in said
sensing step.
The examiner relies on the following references:
Sakamoto et al. (Sakamoto) 4,172,265 Oct. 23, 1979
Rynne et al. (Rynne) 4,950,936 Aug. 21, 1990
Good et al. (Good) 5,377,058 Dec. 27, 1994
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